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This CL converts WTF::PassRefPtr to an alias of WTF::RefPtr, and removes
the implementation.

Bug: 494719
Change-Id: Ide96ef03dfa69668c1de87891a712bcd46470e13
Reviewed-on: https://chromium-review.googlesource.com/657786
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501218}